Supplementary Materials

Phosphorus Selenium Manganese Magnesium Potassium Sodium Calcium Iron Zinc Copper Iodine Niacin Vitamin B12 Vitamin B6 Vitamin B1 Vitamin B2 Vitamin C Pantothenate Vitamins Minerals Vitamin E Vitamin A Folate Vitamin D Biotin

0,00 20,00 40,00 60,00 80,00 100,00

% ACCOMPLISHED % INSUFFICIENT

Figure S1. Percentage of celiac children and adolescents who accomplished or did not achieve 2/3 of the dietary reference intake of the vitamins and minerals (proposed by the Federation of Spanish Societies of Nutrition and Dietetics, FESNAD).

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Table S1. Analyzed gluten free products and ingredients declared on the package label.

Code Product Ingredients Corn semolina 61%, whole cane sugar, bitter cocoa 8% (cocoa dough, whole Cereal Choco balls cane sugar, cocoa butter), cocoa powder 5%, rice flour 4%, quinua flour 4%, Flakes 1 sea salt Buckwheat and millet flakes 30%, sugar, rice flour, vegetable oil, corn flakes Granola (corn flour, salt), chocolate 5% (sugar, cocoa paste, cocoa butter, emulsifier: Cereal choccolate and soy lecithin, flavor), raisins (raisin, vegetable oil), puffed rice, coconut 3.5%, Flakes 2 almonds potato starch, almonds 2%, cocoa, antioxidant: ascorbic palmitate, tocopherols (natural), soy lecithin Cereal Milly Magic Corn semolina, sugar, cocoa powder 8%, iodized salt Flakes 3 Cereals (54.6%) (whole rice flour, corn flour), sugar, skimmed cocoa powder Cereal (6.3%), rapeseed refined oil, hazelnuts (2.1%), lactose, palm oil, whey Choco bites Flakes 4 powder, sunflower refined oil, skimmed milk powder, emulsifier (sunflower lecithin), flavor Cereal Corn, sugar, salt, emulsifier: sunflower lecithin, vitamins: niacin, Corn Flakes Flakes 5 pantothenic acid, B6, riboflavin, thiamine, folic acid, biotin, B12 Cereal Corn Flakes Corn, sugar, salt and corn glucose Flakes 6 Cereal Corn (98.6%), sugar, salt, dextrose, partially inverted whole sugar syrup, Corn Flakes Flakes 7 acidity regulator Cereal Corn Flakes Corn, sugar and salt. Flakes 8 Cereal Corn Flakes Corn 90%, whole cane sugar, rice syrup, sea salt Flakes 9 Cereal Cereals, cocoa Corn semolina (72%), sugar, honey (2.8%), cocoa (powder), dextrin, salt, Flakes 10 and honey vanilla Cereal Corn 93.4%, sugar, salt, emulsifier: sunflower lecithin, vitamins: niacin, Corn Flakes Flakes 11 pantothenic acid, B6, B2, B1, folic acid, biotin and B12 Cereal Corn flour 63%, sugar, cocoa, vegetable oil, emulsifier: soy lecithin, and Choco bubbles Flakes 12 flavors Cereal Honey Balls Corn flour, sugar, honey 3%, sunflower oil, salt Flakes 13 Corn starch, water, rice flour, sugar, sunflower oil, stabilizers, corn fiber, Bread 1 Rustic bread yeast, salt, raising agent (sodium bicarbonate), emulsifiers, preservative, flavors, antioxidant Breadmaking Corn starch, sugar, stabilizer (guar gum and hydroxypropyl methyl Bread 2 preparation cellulose), salt and raising agent (sodium bicarbonate) Breadmaking Corn starch, flax seed flour 12%, buckwheat flour 8%, pea bran, rice bran, Bread 3 Mix apple fiber, sugar, thickener: guar gum, salt Water, corn starch, margarine, water, emulsifier, acidifier, preservative, Bread 4 Vienés baguette flavors, food colour, sugar, tapioca starch, rice flour, thickener, yeast, emulsifier, rice fiber, salt, preservative, raising agents, antioxidant, flavors Corn starch, dextrose, thickener, emulsifier, salt, millet flour, raising agent, Bread 5 Sliced bread preservative, antioxidant, bamboo fiber, yeast, sunflower oil, moisturizing and water Water, corn starch, sourdough, rice starch, cereals, apple fiber, beet syrup, sunflower oil, rice syrup, soy flakes 2.1%, sunflower seeds 2,1%, soy bran Bread 6 Fresh bread 1.9%, flax seeds 1.9%, thickeners, millet flakes 1.4%, soy protein, yeast, sea salt, honey Corn starch 66%, water, sugar, thickener (xanthan gum), emulsifier Precooked (monoacetyl and diacetyl tartaric esters of monoglycerides and diglycerides Bread 7 baguettes of fatty acids), yeast, salt, preservative (calcium propionate), antioxidant (ascorbic acid), raising agents (disodium diphosphate , sodium bicarbonate) Corn starch 49%, water, pasteurized liquid egg, sugar, emulsifiers Gluten free Bread 8 (monoglycerides and diglycerides of fatty acids, monoacetyl and diacetyl breadcrumbs tartaric esters of monoglycerides and diglycerides of fatty acids), salt,

thickener (xanthan gum), raising agents (disodium diphosphate, sodium bicarbonate) Corn starch, sourdough 28% (rice flour, water), water, rice syrup, apple Bread 9 Baguette fiber, rice starch, sunflower oil, soy protein, sugar, thickener: hydroxypropyl methyl cellulose, yeast, salt Corn starch, dextrose, thickener (E-412; E-415; E-466), emulsifier (E-471; E- 472e), salt, millet flour, raising agent (E-500ii; E-E-541i; E-341), preservative Bread 10 Toasts (E-200), antioxidant (E-300), bamboo fiber, yeast, sunflower oil, moisturizing (glicerol) and water Corn starch, vegetable margarine, sugar, salt, water, thickener, emulsifier, Bread 11 Bread roll raising agent, antioxidant, preservative and yeast. Corn starch, water, sugar, pasteurized liquid egg, margarine, sunflower oil, Bread 12 Crispy toasts water, emulsifier, acidity regulator, preservative, flavors, yeast, thickener, emulsifier, salt, preservative, antioxidant, raising agents Pasta 1 Pasta Corn flour and water Rice and corn Pasta 2 Rice flour 87.7%, corn flour 12.3% Penne Pasta Corn flour (55%), rice flour (41.5%), quinua flour (3%), emulsifier E-471 (mono and diglycerides of fatty acids). Pasta with tomato: corn flour (53.5%), Corn macaroni rice flour (39.5%), tomato concentrate (5%), quinua flour (2%), emulsifier E- Pasta 3 propellers with 471 (mono and diglycerides of fatty acids). Pasta with spinach: corn flour vegetables (54.5%), rice flour (41%), quinua flour (2.5%), dehydrated spinach (2%), emulsifier E-471 (mono and diglycerides of fatty acids) Pasta 4 Pasta for Kids Corn flour and water Pasta 5 Penne Corn flour, millet flour, rice flour, sugar cane syrup Pasta 6 Rice noodles Rice flour and corn starch Corn and Rice Pasta 7 Corn flour 79.2%, rice flour 19.8%, soy lecithin Pasta shapes Lasagne mini Pasta 8 Rice flour 87.3%, corn flour 12.7% sheets Corn starch, eggs 23%, rice flour, corn flour, emulsifier (E471), thickener Pasta 9 Pasta all uovo (guar gum) Whole rice Pasta 10 Whole rice flour* (98%), thickener: xanthan gum. *From organic farming macaroni Corn starch, pre-treated corn flour, rice flour, rice starch, pea proteins (5%), Pasta 11 Rigatoni lupine flour (2%), emulsifier: mono and diglycerides of fatty acids Dough 55%, corn starch, egg powder, glucose syrup, sugar, stabilizers, salt Pasta 12 Meat cannelloni and water + meat filling